import { asyncRouterMap, constantRouterMap } from '@/router/routerMap';

/**
 * 通过meta.role判断是否与当前用户权限匹配
 * @param permissions
 * @param route
 */
function hasPermission(permissions, route) {
  if (route.meta && route.meta.permission) {
    return permissions.some(per => per === '*' || route.meta.permission.indexOf(per) >= 0);
  }
  return true;
}

/**
 * 递归过滤异步路由表，返回符合用户角色权限的路由表
 * @param asyncRouterMap
 * @param permissions
 */
function filterAsyncRouter(routerMap, permissions) {
  const accessedRouters = routerMap.filter((route) => {
    if (hasPermission(permissions, route)) {
      if (route.children && route.children.length) {
        route.children = filterAsyncRouter(route.children, permissions);
      }
      return true;
    }
    return false;
  });
  return accessedRouters;
}


const permission = {
  state: {
    routers: constantRouterMap,
    addRouters: [],
  },
  mutations: {
    SET_ROUTERS: (state, routers) => {
      state.addRouters = routers;
      state.routers = constantRouterMap.concat(routers);
    },
  },
  actions: {
    GenerateRoutes({ commit }, { permissions }) {
      return new Promise((resolve) => {
        const accessedRouters = filterAsyncRouter(asyncRouterMap, permissions);
        commit('SET_ROUTERS', accessedRouters);
        resolve();
      });
    },
  },
};

export default permission;
